SEVENTH ANNUAL RECEPTION. 519 



d. Head of Rattlesnake (Crotalus adamanteus) show- 



ing the poison fangs partially raised. 



e. Head of Rattlesnake (Crotalus terrificus) showing 



the fangs raised as in the act of biting. 



. f. Head of Rattlesnake (Crotalus adamanteus var. 

 atrox). The fangs are fully raised. 



g. Head of Water Moccasin (Ancistrodon piscivorus). 

 In this example the fangs rest against the roof 

 of the mouth. 



li. Skeleton head of Rattlesnake (Crotalus adaman- 

 teus), showing the dentition. 



i. Chart, showing dissection of the head of a poison- 

 ous snake. The gland secreting the venom is 

 seen behind the eye. 



j. Snake venom. Dried and in liquid form. 



k. Fang of poisonous snake under magnifying glass. 

 i6. Developmental Stages of Some Australian Animals. 

 Exhibited by Bashford Dean. 



1. Specimens illustrating Development of Spiny Ant-Eater 



(Echidua). 



2. Specimens illustrating Development of Various Aus- 



tralian Marsupials. 



3. Large Embryos of Ceratodus. 



